StudioCanal is financing development of the project, which is being produced by Kevin McCormick’s Langley Park banner

Emily Blunt is attached to star in the psychological thriller “Sister,” which Kevin McCormick (“Gangster Squad”) is developing under his Langley Park banner, TheWrap has learned.

StudioCanal is financing development of the project, which is based on Rosamund Lupton’s bestselling novel “Sister.” The project is near and dear to Blunt, whose own sister, literary agent Felicity Blunt, represents the book, which has sold more than one million copies worldwide.

The London-based mystery follows Beatrice (Blunt) as she investigates the death of her younger sister Tess, whose death is ruled a suicide by police. Convinced that her sister was murdered, Beatrice sets out to uncover the strange events leading up to Tess’ death, though she may pay a terrible price for the truth.

Rory Koslow will oversee the project for Langley Park, which is currently searching for a writer to adapt Lupton’s novel.

Blunt has spent most of 2013 on movie sets, filming the female lead opposite Tom Cruise in Doug Liman’s futuristic action movie “Edge of Tomorrow,” as well as the role of the Baker’s Wife opposite James Corden in Disney’s “Into the Woods.” Those movies are scheduled for release next year on June 6 and Christmas Day, respectively.

Langley Park is currently developing an adaptation of Robert Kolker’s true crime book “Lost Girls,” a Boston Strangler movie with Casey Affleck attached to star and an adaptation of Jo Nesbo’s novel “The Son,” which like “Sister,” features a protagonist questioning the suicide of a family member.

Blunt was last seen wielding a shotgun in “Looper” and is no stranger to movies about siblings, having starred in “Your Sister’s Sister.” She’s represented by CAA and attorney David Weber.

Guess who’s the latest Hollywood starlet with a bun in the oven? Emily Blunt and husband John Krasinski are set to welcome a tiny bundle of joy in just a few months’ time, a rep for the actress confirms to Us Weekly.

The couple, who tied the knot in a star-studded ceremony in Italy in 2010, have never been shy about their desire for children, and have been making moves to ready themselves for parenthood, a source tells Us.

“They both want kids, it’s one of the reasons they got a bigger place, in a neighborhood that you can raise a family,” the source explained. “They both couldn’t be more excited.”

In an interview with Manhattan magazine last year, the 30-year-old British actress opened up about their hope to start a family.

“We want to have children; I just don’t know when yet,” the Devil Wears Prada star told the magazine. “I’m just not sure about the timing of all of that. We’re both from big families, so I think it’s something we want.”

A few months later, Krasinski, 33, told Matt Lauer on the Today show that he has been getting a taste of fatherhood from his pals who are already dads, like Matt Damon, with whom he was working at the time on the film Promised Land.

“We actually wrote with children climbing all over him, and he was doing bath time and dinner and everything, and we still got it done,” the former Office star said at the time.

Emily Blunt was reportedly rejected by UNICEF after it decided she wasn’t famous enough to become one of their celebrity ambassadors.

The Devil Wears Prada actress was courted by the London office of the United Nations Children’s Fund but they are said to have withdrawn their request to work with her after executives in New York vetoed the appointment.

A source told MailOnline: “UNICEF was keen to court Emily and made contact with her.

“She’s a big name in British cinema, glamorous, and very much on the rise after winning some big accolades, so she seemed to be a perfect addition.

“It’s a big deal to be asked, and Emily’s people were keen to get her involved. But all of the celebrities in the list have to be signed off in New York and some of the senior management didn’t feel she was enough of a star, so they’ve gone cold on her.

“It is very disappointing for Emily and quite embarrassing for her. More than anything, she has supported UNICEF in the past and would have loved to do more to help what she believes is a fantastic charity.”

A spokeswoman for UNICEF confirmed they had been in discussions with Emily but insisted she had not been rejected.

She said: “UNICEF would love to work with Emily Blunt and hopes that there will be opportunities in the future.”

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